Pressurized gas source

A pressurized gas source comprising:

• a gas cylinder comprising:
• a body having a storage volume for pressurized gas and a neck having a top surface with a piercable gas outlet;
• a flange secured to the neck and arranged to support the gas cylinder for piercing of the gas outlet, the flange extending radially outwardly from the neck;
• a cap secured to the neck and having a sidewall extending around the top surface and defining an inner space and an upper opening to the inner space;
• and
• a gasket located in the inner space and arranged to form a seal with the top surface and form a seal with a piercing element that extends into the inner space to pierce the gas outlet;
• a housing including a support for the gas cylinder, the support arranged to support the gas cylinder such that the piercable gas outlet of the gas cylinder is positioned above other portions of the gas cylinder;
• a piercing lance arranged to pierce the outlet of the gas cylinder to release the pressurized gas;
• a gas outlet mounted to the housing, fluidly coupled to the piercing lance and arranged to provide the pressurized gas for delivery to the beverage container, the gas outlet including a valve that is normally closed and is opened by moving a portion of the valve upwardly by pressing the housing downwardly relative to the portion of the valve;
• and
• a gas flow path including a conduit and arranged to route flow of gas from the outlet of the gas cylinder upwardly and then downwardly to the gas outlet.